Overview

The Civil Aviation Regulations 1998, enacted by the Commonwealth of Australia, is a comprehensive piece of legislation that governs various aspects of civil aviation, including aircraft design, manufacture, maintenance, and operation within Australia. Specifically, Part 39 - 105 of these regulations addresses the authority to issue airworthiness directives to ensure the safe operation of aircraft. This legislative instrument aims to address safety issues by mandating specific actions or modifications to maintain the airworthiness of aircraft. The Civil Aviation Safety Authority, as the enforcing body, introduced this amendment to address a critical safety issue identified in American Champion (Aeronca, Bellanca) series aeroplanes. Following a fatal accident that revealed fatigue cracking in the wing front strut fittings, the directive requires specific inspections and, if necessary, replacement of these fittings to prevent similar incidents in the future. This policy objective is to enhance the safety of air travel by ensuring that aircraft meet stringent airworthiness standards.

Scope and Application

The Civil Aviation Safety Authority's Airworthiness Directive AD/CHA/25 Amendment 1, applies specifically to certain models and serial numbers of American Champion (Aeronca, Bellanca) series aeroplanes. These include specific serial numbers within the 8KCAB, 8GCBC, 7GCBC, 7ECA, 7GCAA, and 7KCAB models, all equipped with designated metal spar wings assemblies. The directive mandates the installation of inspection holes and removable covers in accordance with relevant American Champion Service Letters to ensure these aircraft maintain airworthiness standards. The requirement is for compliance within 20 hours of time in service after 2 October 1996, with interim inspections permitted if replacement parts are unavailable. This legislative instrument is part of the Civil Aviation Regulations 1998, which govern the safety of civil aviation in Australia, and is enforced by the Civil Aviation Safety Authority. The directive is aimed at rectifying issues identified through a fatal accident investigation overseas, and it extends its reach to ensure the safety of these specific aircraft models within Australia.

Key Provisions

The Civil Aviation Safety Authority (CASA) has issued an Airworthiness Directive (AD) for American Champion aeroplanes, specifically targeting the wing front strut fittings (AD/CHA/25 Amendment 1). This directive applies to specific model series and serial numbers, which include the 8KCAB models with serial numbers ranging from 643-90 to 768-96, and all other serial numbers equipped with metal spar wings assembly P/N 7-1521; the 8GCBC models with serial numbers from 361-91 to 377-96, and all other serial numbers with metal spar wings assembly P/N 7-1542; the 7GCBC models with serial numbers from 1200-94 to 1215-96 and all other serial numbers with metal spar wings assembly P/N 7-1541; the 7ECA models with serial numbers from 1355-95 to 1358-96 and all other serial numbers with metal spar wings assembly P/N 7-1567; and the 7GCAA and 7KCAB models equipped with metal spar wings assembly P/N 7-1567. The AD mandates two key actions. Firstly, it requires the installation of inspection holes and removable covers in accordance with specified American Champion Service Letters (SLs). For instance, 8KCAB models must comply with SL 408 to SL 410 or SL 411 if not already in compliance with SL 408. Similarly, 7ECA, 7GCAA, 7GCBC, and 8GCBC models must adhere to SL 409 Rev A to SL 412 or SL 409 Rev A to SL 413 if not already compliant. Secondly, the directive mandates the replacement of the wing front strut attach fittings in line with American Champion SL 414 Rev. A or 415 Rev. A, as appropriate. This replacement must occur within 20 hours of time in service after 2 October 1996, unless the replacement parts are unavailable, in which case continued inspection is permitted. Operators of these aircraft must ensure that the specified modifications are completed within the stipulated timeframe. If replacement wing front strut fittings are not available from the manufacturer, operators are authorised to conduct inspections at intervals not exceeding 20 hours of time in service until one of three conditions is met: cracking, scratches, or surface deformities are detected on an attach fitting, replacement parts become available from American Champion, or five repetitive inspections have been conducted (totalling 120 hours of time in service). Failure to comply with this Airworthiness Directive may result in serious safety issues, given the directive was issued following a fatal accident due to fatigue cracking of the wing front strut fittings. CASA imposes strict compliance to ensure the airworthiness of these aeroplanes. Non-compliance could lead to severe consequences, including grounding of the aircraft, enforcement actions, and potential legal repercussions for operators.